Dual-Function Fluorescence Sensors Based on Interpenetrated Isomeric Cd-MOFs: Selective Detection of 2,4,6-Trinitrophenol and Nitrofurazone

possess low detection limits (0.32 and 0.24 μM for TNP and 0.34 and 0.15 μM for NFZ), strong anti-interference ability, good reusability, and structural stability. Spectroscopic overlapping and fluorescence lifetime shortening imply a dynamic quenching mechanism. X-ray photoelectron spectroscopy (XPS) analysis further suggests electron transfer from the MOF skeleton to analytes of TNP/NFZ. This study provides an example of solvent-regulated interpenetration isomerism in MOFs, reveals its modulatory role in fluorescence response behaviors, and offers new insights for designing ratiometric fluorescence sensors.